Mechanisms of charge photogeneration in amorphous selenium under high electric fields

In this paper, we have investigated the physical mechanisms for excitation wavelength and electric field-dependent charge carrier photogeneration in amorphous selenium (a-Se) under high electric fields. Although the photogeneration efficiency at low to moderate electric field in a-Se has been most s...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2016-07, Vol.27 (7), p.7534-7539
Main Authors: Hijazi, Nour, Kabir, M. Z.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Computational efficiency
Computing time
Electric fields
Electronics
Excitation
Materials Science
Mathematical models
Optical and Electronic Materials
Selenium
Wavelengths
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we have investigated the physical mechanisms for excitation wavelength and electric field-dependent charge carrier photogeneration in amorphous selenium (a-Se) under high electric fields. Although the photogeneration efficiency at low to moderate electric field in a-Se has been most successfully described by the conventional Onsager theory of dissociation, this theory fails at very strong electric fields (Reznik et al. in Appl Phys Letts 100:132101, 2012 ). We have proposed a formulation for calculating the excitation wavelength and electric field-dependent initial separation of the photogenerated and thermalized geminate electron and hole, and applied it to explain the field-dependent photogeneration efficiency in a-Se. We have also adapted the exact extension of the Onsager model in order to explain the experimental results at very strong electric fields.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-016-4733-9